Improv Everywhere has launched their most modern live art installation yet. The group, known for launching mass public spectacles, recruited thousands of participants, each armed with colorful balloons and MP3 players containing preloaded tracks.

At the same time, they all flicked on the same track and acted out the instructions heard over the headphones. The result was a remarkable, improvised, public party in the streets.

The Mp3 Experiment took place in four different metropolitans in North America, New York, San Francisco, Chicago and Toronto.